根据验证结果切换元素可见性

Given the following HTML

给出以下HTML

<form class="form-horizontal"
      asp-controller="Installation"
      asp-action="CreateUser"
      method="post">
    <fieldset>

        <!-- Form Name -->
        <legend>Account Creation</legend>

        <!-- Username input-->
        <div class="form-group">
            <label class="col-md-4 control-label" for="userName">Username</label>
            <div class="col-md-4">
                <input id="UserName" name="UserName" asp-for="UserName" type="text" placeholder="Username" class="form-control input-md" required="">
                <span id="usernameTip" class="help-block hidden">Enter a unique Username</span>
                <span class="has-error" asp-validation-for="UserName"></span>
            </div>
        </div>

        <!-- Email input-->
        <div class="form-group">
            <label class="col-md-4 control-label" for="email">E-mail</label>
            <div class="col-md-4">
                <input id="email"
                       name="email"
                       type="text"
                       placeholder="[email protected]"
                       class="form-control input-md"
                       required=""
                       asp-for="Email">
                <span class="help-block">Enter your e-mail address</span>
            </div>
        </div>

        <!-- Password input-->
        <div class="form-group">
            <label class="col-md-4 control-label" for="password">Password</label>
            <div class="col-md-4">
                <input id="password"
                       name="password"
                       type="password"
                       placeholder="password"
                       class="form-control input-md"
                       required=""
                       asp-for="Password">
                <span class="help-block">Enter a password that is at least 8 characters, fewer than 30</span>
            </div>
        </div>

        <!-- Password input-->
        <div class="form-group">
            <label class="col-md-4 control-label" for="confirmPassword">Confirm Password</label>
            <div class="col-md-4">
                <input id="confirmPassword"
                       name="confirmPassword"
                       type="password"
                       placeholder="password"
                       class="form-control input-md"
                       required=""
                       asp-for="PasswordConfirmation">
                <span class="help-block">Re-enter your password</span>
            </div>
        </div>

        <!-- Submit -->
        <div class="form-group">
            <label class="col-md-4 control-label"
                   for="createAccount"></label>
            <div class="col-md-4">
                <button id="createAccount" type="submit" name="createAccount" class="btn btn-primary">Create Account</button>
            </div>
        </div>

    </fieldset>
</form>
<form cla